Straw-cooker.



` 1 PATENTED PEB. 11 J. J. DAUGH & w. P. HARBREGHT.

STRAW GOOKER. APPLIOATION FILED JULY ze, 1906.

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UNITED sTATEs PATENT .oFFICE JACOB J. DAUCH AND WILLIAM F. HARBRECHT, OFSANDUSKY, OHIO.

STRAW-COOmR.

To all 107mm it may concern:

Be it known that we, JACOB J. DAUCH and WILLIAM F. HARBRECHT, bothcitizens ofthe United States, residents of Sandusky, county' of Erie,and State of Ohio, have invented a. new and useful Im rovement inStraw-V (,.ookers, of'which the iollowing is a specifica- 4 tion, therinciple of the invention being herein explained and the best mode inwhich we have contemplated applying that principle, so as to distinguish1t from other inven-4 tions.

,Our invention relates to improvements in pulp-digesters andparticularly in those used in cooking straw which Inaterial isextensively used in the manufacture of strawboard and certain kinds ofwrapping papers.

Obviously l1owever,'in the use of our cooker the character of the stockis immaterial and such cooker may be employed in the digesting of ragsand the like as well as straw and other materials with. equallysatisfactory results.

The invention is concerned particularly with the arrangement of andmanner of supply of the steam distributing pipes, withm the boiler orshell of the cooker, the object being to provide a `simple valveconstruction for supplying steam to the submerged pipes only, and to sodispose the apertures whereby the steam escapes from such distributingpipes as to insure the thorough inter-mixture of the. contents ofl thecooker.

Said invention, then, consists of means herein after fully described andspecifically set forth in the claims. f

The annexed drawing and the'following descri tion set forth in detailcertain means embodying the invention, such disclosed meansconstitutingbut one of various mechanical forms in which the principleof the invention may be used.

In said annexed drawing:w-Figure 1 represents a longitudinal axialcross-section of a cooker embodying my invention; Fig. 2 represents atransversevertical cross-section of the valve whereby steam-is suppliedto the steam distributing pipes ofsuch cooker; and

v Fig. 3 shows a transverse cross-section of one of thesteam-distributing pipes and the adjacent portion of thecookerwall. 'f

In said `figures, A designates the tank or boiler of our cookerpwhich isshown as being Specification of Letters Patent.

Application filed July Z6. 1906. Serial No. 327.812.

of the approved spherical or globular formu rammed Feb. 1 1, 190s.

Such tank is 'rotatably supported at diametrically opposite points u ongud eons or trunnions a. securely attached to t e boiler shell andturning in suitable bearings a. Of such bearings, however, andcorresponding supports a2 ol'- timber or other material, but one appearsin the iigures. The means whereby rotation is 'imparted to the tanks arelikewise omitted, since they form no of this present invention. As shownin 1, the tank has been partially rotated from its'norma-l, vorcharging, position so that the manhole c3, through which access is hadto the interiory of the tank, appears on the 'farther side of the halfsection. 1

The general process of` cooking paper stock, it is takenis ,well enou hunderstood not to require extensive eX anation here. It will, hence,suflice tosay, that preparatory to the operation, the straw, rags orother stock is introduced into tank A through man- 4hole a3, along witha quantity of cooking liquor of maximum strength. Such liquor it isunderstood comprises a solution of chemicals adapted to effect adisintegration of the material being treated. Live steam under pressureis thereupon admitted into the tank and the latter at the same time is.rotated so as to agitate its contents and insure. contact ofA thechemical cooking liquor with every portion of the stock. It is to themeans that we em )loy forv introducing the steam that it is desired tohere call particular attention. For this purpose, one of the trunnions au on which the tank is mounted is formed Wit an 'axialaperture or borea, and the portion of the boiler shellv opposite the inner end of thisbore is cut away. In the opening in the shell thus formed, is mounted avalve-casing B of the general cylindrical form illustrated in Figs. land 2.' Such casing B is' provided, equidistantly spaced about itscylindrical face, with a plurality of openings b. Into these openingsare screw-threaded the ends of steam-distributing pipes B that aremeridionally dis osed within the boiler, being attached to t e inside ofthe Walls of such boiler by means of clips b and having their outerends, which converge towards the portion of the boiler opposite tovalve-casing B, closed by means of caps b2. The steam sma openings b3that are arranged in stagescaHes from distributing pipes B through'votherwise securely mounted'upon the inner .tributing pipes B', which itwill be rememby this method of operation are highly valuable in that thecollection of sediment as gered order on the side of the pi es turned ltowards thehboiler wall. To in icate still41 more definitely thepreferred' disposition of i these apertures b3 they may be described asbein alternately located on o posite sides of aline drawn longitudinallya ong the pipe on its outer face and at an angle laterally divergenttherefrom f'about forty-five degrees. This construction quite clearly appears in Fig. 3.

The steam for steam-distributing pipes B is received through a pi e B2connected at its outer lend with a suita le source of supply andextending inwardly throughthe bore 0,4 in trunnion a so as to terminatewithin valvecasing B. A stufiing box a5 and gland a provide a bearinfJrfor the outer end of supply pi e B2,'which obviously remains stationaryW lile the tank revolves. 4Fitting within valve-casing B, 'andscrew-threaded, or

end of su ply pipe B2, is a cylindrical valve b4. As s lown in Figs. 1and 2, valve b4 is provided with a port b5 adapted to uncover at any onetime the ends of but two disbered are connected with opening 2)' invalvecasing B. As appears in Fig. 2 the disposition of valve b4 is suchas to turn ort b5 Adirectly downwardly,` asa result of w ich it is seenthat steamis supplied to the two lowermost of distributing pipes B only,that is to the ones that are successively submergedv by the semi-liquidcontents of the boiler as the latter rotates on its axis. The generalmode of operation of our improved straw-cooker has been' incidentallyset forth in connection with the description given of its structure. Inconclusion then it remains to state what are the new results at? tainedby our improvements. First of all it should be remarked that we do notset up as broadly new the lregulation of the supply of steam todistributing-pipes B so as to cut off all but those that are submerged.We do, however, set up the construction of the valve whereby this resultis achieved as being simpler in'construction and operation than anyheretofore devised for this purpose so far-as we are aware. By thearrangement of the apertures b3 in distributing pipes B', the steam asit escapes from the submerlged pipes to which it is thus supplied, is.irst directed downwardly, or outwardly lagainst the Walls of theboiler. The results secured well as ofstock unaffected by the chemicalsin the Hcooking liquor along the walls of the boiler is prevented,sincej'the escaping jets of steam are made to penetrate to the verybottom of the mass and in rising permeato the whole. A uniform, as wellas thorough cooking of the stock is thus eected.

Having thus described our invention, that which we particularly pointout and distinctly claim, is z l1. ln a pulp-digester, thev combinationwith a rotary boiler, of meridionally .arranged steam-distributing pipeswithin said rotary b'oilerand disposed against the inside of the wallsthereof, said pipes being respectively provided with apertures for theescape of stelam on the side adjacent to the tank-walls on y.

2. In a ulp-digester, the combination of a rotary boller, a steam supplypipe, a series of meridionally arranged steam-distributing pipes withinsaid boiler, said pipes being connected with said-supply pipeand beingre# spectively provided with apertures foiythe escape of steam on theside adjacent to the walls only of said rotary boiler, and a yvalvecontrolling connection between said sup ly pipe and said distributingpipes, said va ve eing adapted to connect such supply pipe with aplurality of distributing pipes successively submerged in the course ofsaid boilers rotation.

3. In a pulp digester, the combination of a spherical boiler rotatablymounted -upon trunnions, one of said trunnions being rovided with anaxial bore, a cylindrical va vecasing fitted .in a recessed portion ofone of the trunnions and having one end closed and mounted with theother o )en end over the inner end of such bore, ya pllurality ofmeridionally arranged steamdistributing pipes within said boiler, eachpipe having apertures for the escape 'of steam on the side adjacent tothe walls only of said rotary boiler, said pipes being connected withsaid valve-casing, a steam supply pipe mounted in the -bore in saidtrunnion and extending within said valve-casing, and a cylindrical valvemounted within said casing and connected with said supply pipe, saidvalve being provided "with a port disposed to connect said supply pipewith a plurality of distributing ipes successively submerged in thecourse o said boilers rotation.

Signed by JACOB J. DAUCH, this 11th day WILLIAMF. HARBRECHT.

Attested by:

FRED EMMoNs, L. D. MonroN.

